userdiff.c

   1 #include "cache.h"
   2 #include "userdiff.h"
   3 #include "cache.h"
   4 #include "attr.h"
   5
   6 static struct userdiff_driver *drivers;
   7 static int ndrivers;
   8 static int drivers_alloc;
   9
  10 #define PATTERNS(name, pattern, word_regex)                     \
  11         { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
  12 static struct userdiff_driver builtin_drivers[] = {
  13 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  14          "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  15 PATTERNS("java",
  16          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
  17          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
  18          /* -- */
  19          "[a-zA-Z_][a-zA-Z0-9_]*"
  20          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  21          "|[-+*/<>%&^|=!]="
  22          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
  23          "|[^[:space:]]|[\x80-\xff]+"),
  24 PATTERNS("objc",
  25          /* Negate C statements that can look like functions */
  26          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  27          /* Objective-C methods */
  28          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
  29          /* C functions */
  30          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
  31          /* Objective-C class/protocol definitions */
  32          "^(@(implementation|interface|protocol)[ \t].*)$",
  33          /* -- */
  34          "[a-zA-Z_][a-zA-Z0-9_]*"
  35          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  36          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  37          "|[^[:space:]]|[\x80-\xff]+"),
  38 PATTERNS("pascal",
  39          "^((procedure|function|constructor|destructor|interface|"
  40                 "implementation|initialization|finalization)[ \t]*.*)$"
  41          "\n"
  42          "^(.*=[ \t]*(class|record).*)$",
  43          /* -- */
  44          "[a-zA-Z_][a-zA-Z0-9_]*"
  45          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  46          "|<>|<=|>=|:=|\\.\\."
  47          "|[^[:space:]]|[\x80-\xff]+"),
  48 PATTERNS("php",
  49          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
  50          "^[\t ]*(class.*)$",
  51          /* -- */
  52          "[a-zA-Z_][a-zA-Z0-9_]*"
  53          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
  54          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
  55          "|[^[:space:]]|[\x80-\xff]+"),
  56 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  57          /* -- */
  58          "[a-zA-Z_][a-zA-Z0-9_]*"
  59          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  60          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  61          "|[^[:space:]|[\x80-\xff]+"),
  62          /* -- */
  63 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  64          /* -- */
  65          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
  66          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
  67          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
  68          "|[^[:space:]|[\x80-\xff]+"),
  69 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  70          "[={}\"]|[^={}\" \t]+"),
  71 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
  72          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
  73 PATTERNS("cpp",
  74          /* Jump targets or access declarations */
  75          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
  76          /* C/++ functions/methods at top level */
  77          "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
  78          /* compound type at top level */
  79          "^((struct|class|enum)[^;]*)$",
  80          /* -- */
  81          "[a-zA-Z_][a-zA-Z0-9_]*"
  82          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  83          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
  84          "|[^[:space:]]|[\x80-\xff]+"),
  85 PATTERNS("csharp",
  86          /* Keywords */
  87          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
  88          /* Methods and constructors */
  89          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
  90          /* Properties */
  91          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
  92          /* Type definitions */
  93          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
  94          /* Namespace */
  95          "^[ \t]*(namespace[ \t]+.*)$",
  96          /* -- */
  97          "[a-zA-Z_][a-zA-Z0-9_]*"
  98          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  99          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
 100          "|[^[:space:]]|[\x80-\xff]+"),
 101 { "default", NULL, -1, { NULL, 0 } },
 102 };
 103 #undef PATTERNS
 104
 105 static struct userdiff_driver driver_true = {
 106         "diff=true",
 107         NULL,
 108         0,
 109         { NULL, 0 }
 110 };
 111
 112 static struct userdiff_driver driver_false = {
 113         "!diff",
 114         NULL,
 115         1,
 116         { NULL, 0 }
 117 };
 118
 119 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
 120 {
 121         int i;
 122         for (i = 0; i < ndrivers; i++) {
 123                 struct userdiff_driver *drv = drivers + i;
 124                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 125                         return drv;
 126         }
 127         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
 128                 struct userdiff_driver *drv = builtin_drivers + i;
 129                 if (!strncmp(drv->name, k, len) && !drv->name[len])
 130                         return drv;
 131         }
 132         return NULL;
 133 }
 134
 135 static struct userdiff_driver *parse_driver(const char *var,
 136                 const char *value, const char *type)
 137 {
 138         struct userdiff_driver *drv;
 139         const char *dot;
 140         const char *name;
 141         int namelen;
 142
 143         if (prefixcmp(var, "diff."))
 144                 return NULL;
 145         dot = strrchr(var, '.');
 146         if (dot == var + 4)
 147                 return NULL;
 148         if (strcmp(type, dot+1))
 149                 return NULL;
 150
 151         name = var + 5;
 152         namelen = dot - name;
 153         drv = userdiff_find_by_namelen(name, namelen);
 154         if (!drv) {
 155                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 156                 drv = &drivers[ndrivers++];
 157                 memset(drv, 0, sizeof(*drv));
 158                 drv->name = xmemdupz(name, namelen);
 159                 drv->binary = -1;
 160         }
 161         return drv;
 162 }
 163
 164 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 165                 const char *v, int cflags)
 166 {
 167         if (git_config_string(&f->pattern, k, v) < 0)
 168                 return -1;
 169         f->cflags = cflags;
 170         return 1;
 171 }
 172
 173 static int parse_string(const char **d, const char *k, const char *v)
 174 {
 175         if (git_config_string(d, k, v) < 0)
 176                 return -1;
 177         return 1;
 178 }
 179
 180 static int parse_tristate(int *b, const char *k, const char *v)
 181 {
 182         if (v && !strcasecmp(v, "auto"))
 183                 *b = -1;
 184         else
 185                 *b = git_config_bool(k, v);
 186         return 1;
 187 }
 188
 189 static int parse_bool(int *b, const char *k, const char *v)
 190 {
 191         *b = git_config_bool(k, v);
 192         return 1;
 193 }
 194
 195 int userdiff_config(const char *k, const char *v)
 196 {
 197         struct userdiff_driver *drv;
 198
 199         if ((drv = parse_driver(k, v, "funcname")))
 200                 return parse_funcname(&drv->funcname, k, v, 0);
 201         if ((drv = parse_driver(k, v, "xfuncname")))
 202                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 203         if ((drv = parse_driver(k, v, "binary")))
 204                 return parse_tristate(&drv->binary, k, v);
 205         if ((drv = parse_driver(k, v, "command")))
 206                 return parse_string(&drv->external, k, v);
 207         if ((drv = parse_driver(k, v, "textconv")))
 208                 return parse_string(&drv->textconv, k, v);
 209         if ((drv = parse_driver(k, v, "cachetextconv")))
 210                 return parse_bool(&drv->textconv_want_cache, k, v);
 211         if ((drv = parse_driver(k, v, "wordregex")))
 212                 return parse_string(&drv->word_regex, k, v);
 213
 214         return 0;
 215 }
 216
 217 struct userdiff_driver *userdiff_find_by_name(const char *name) {
 218         int len = strlen(name);
 219         return userdiff_find_by_namelen(name, len);
 220 }
 221
 222 struct userdiff_driver *userdiff_find_by_path(const char *path)
 223 {
 224         static struct git_attr *attr;
 225         struct git_attr_check check;
 226
 227         if (!attr)
 228                 attr = git_attr("diff");
 229         check.attr = attr;
 230
 231         if (!path)
 232                 return NULL;
 233         if (git_checkattr(path, 1, &check))
 234                 return NULL;
 235
 236         if (ATTR_TRUE(check.value))
 237                 return &driver_true;
 238         if (ATTR_FALSE(check.value))
 239                 return &driver_false;
 240         if (ATTR_UNSET(check.value))
 241                 return NULL;
 242         return userdiff_find_by_name(check.value);
 243 }